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is there a reset button under the dash for the computer when car sets long period of time without battery and you install a new battery

We have replaced the sensor twice and replaced the coolant.  It does it even when we first start the car up.

This past weekend my car was driven about 15 miles with the emergency brake on. After that the check engine light starting blinking. I went by Autozone and the codes they gave me were P0500 Vehicle Speed Sensor and P1101 Neutral Switch Circuit High Input (A/T). NEither one sounds super urgent, the car is driving fine with no issues. I am just wondering if anyone has any ideas on fixing the problems or if it is super urgent.

considering buying the car with 190K miles. Only the head gasket has been replaced – good idea or not?  Everything else looks good on the car.

The guy has a good reputation but I’m wondering about damage done to engine when first gasket failed.  How many miles could I expect to get out of this car with the new gasket?

Thanks for replies!